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Central visual acuity of 20/200 or less in the better eye with corrective glasses or central visual acuity of more than 20/200 if there is a visual field defect in which the peripheral field is contracted to such an extent that the widest diameter of the visual field subtends an angular distance no greater than 20 degrees in the better eye. [22]
A reference value above which visual acuity is considered normal is called 6/6 vision, the USC equivalent of which is 20/20 vision: At 6 metres or 20 feet, a human eye with that performance is able to separate contours that are approximately 1.75 mm apart. [9] Vision of 6/12 corresponds to lower performance, while vision of 6/3 to better ...
Those with LCA invariably experience vision problems. Affected infants show decreased visual response to objects. Loss of visual acuity is severe, with affected individuals' vision ranging from 20/200 to 20/400. [note 1] Around a third of those affected completely lose perception of light. [10] At an eye exam, the pupils may not respond ...
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By Nathan Rousseau Smith, Buzz60. Eyesight is arguably one of the most devastating senses a person can lose, and damaging it is all too common. According to the CDC, 3.4 million Americans aged 40 ...
The World Health Organization classifies [1] [2] people with low vision as follows: 1. 6/18 (20/60) [0.5] to 6/60 (20/200) [1.0] 2. 6/60 (20/200) [1.0] to 3/60 (20/400) [1.3] 3. 3/60 (20/400) [1.3] to 1/60 (20/1200) [1.8] readings from left to right are in metres, feet and LogMAR values
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The largest letter on an eye chart often represents an acuity of 6/60 (20/200), the value that is considered "legally blind" in the US. Many individuals with high myopia cannot read the large E without glasses, but can read the 6/6 (20/20) line or 6/4.5 (20/15) line with glasses. By contrast, legally blind individuals have a visual acuity of 6/ ...